diff --git a/src/docs/openapi.v2.yml b/src/docs/openapi.v2.yaml
similarity index 100%
rename from src/docs/openapi.v2.yml
rename to src/docs/openapi.v2.yaml
diff --git a/src/routers/docs/v2.ts b/src/routers/docs/v2.ts
index ea0b6f5..5cc08c6 100644
--- a/src/routers/docs/v2.ts
+++ b/src/routers/docs/v2.ts
@@ -11,7 +11,7 @@ app.get(
     pageTitle: "Simple Logging Server API Reference",
     theme: "purple",
     spec: {
-      url: "/static/openapi.v2.yml",
+      url: "/static/openapi.v2.yaml",
     },
   }),
 );
diff --git a/src/utils/openapi-docs.ts b/src/utils/openapi-docs.ts
index 5ba1d01..1cfcdaa 100644
--- a/src/utils/openapi-docs.ts
+++ b/src/utils/openapi-docs.ts
@@ -7,7 +7,7 @@ type OpenApiDocTransformer = (dirVersion: string, doc: string) => string;
  * Modify the OpenAPI doc with the provided transformers and write the file to the static directory.
  */
 export function transformOpenapiYmlDoc(dir_version: string, transformers: OpenApiDocTransformer[] = []): void {
-  const openapiFilename = `openapi.${dir_version}.yml`;
+  const openapiFilename = `openapi.${dir_version}.yaml`;
 
   const openapiYmlSourcePath = join(__dirname, "..", "docs", openapiFilename);
   const openapiYmlOutPath = join(__dirname, "..", "..", "public", "static", openapiFilename);